Peelable Sealant Composite for Hermetic Packaging Seals
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Solution Overview
Problem
Existing peelable packaging systems face challenges in consistently forming hermetic seals that resist leaking, especially when wrinkles, pleats, or gussets are present, and often operate within narrow temperature ranges, leading to packaging defects such as leaking or non-peelable seals.
Innovation Solution
A packaging system with a peelable seal section comprising a first sealing layer made of a thermoplastic polymer with dispersed organoclay and calcium carbonate, where the combined weight of these additives ranges from 10 to 35 weight % of the thermoplastic polymer, providing a peel force between 0.5 lbs and 5 lbs per inch of sealing width, ensuring consistent sealing over a broad temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-layered sheets are used for peelable seals, then the seal can provide some peeling functionality, but it becomes difficult to consistently form hermetic seals that resist leaking when wrinkles, pleats, and gussets are present
Solution Approach 1:
The patent uses a composite sealant composition containing thermoplastic polymer, organoclay (5-20 wt%), and inorganic filler (6-25 wt%), where the combination of organic and inorganic components creates a material that simultaneously provides hermetic sealing capability and controlled peeling characteristics, resolving the contradiction between seal reliability and structural complexity
Solution Approach 2:
The patent modifies the chemical composition parameters of the sealant by incorporating specific amounts of organoclay and inorganic filler, which changes the material's rheological and thermal properties to enable consistent hermetic sealing across varying package geometries including wrinkles and gussets
2Adaptability or versatility
If earlier peelable packaging systems are used, then the package can be opened, but they operate over relatively narrow temperature sealing ranges resulting in packaging defects
Solution Approach 1:
The patent broadens the sealing temperature range by adjusting the compositional parameters of the sealant, specifically the ratio and types of thermoplastic polymer, organoclay, and inorganic filler, which allows the seal to maintain proper adhesion and cohesion properties across a wider temperature window, reducing defects like leaking or non-peelable seals
Solution Approach 2:
The composite nature of the sealant composition, combining organic polymer matrix with inorganic organoclay and filler components, creates a material system with enhanced thermal stability and controlled melting behavior, enabling consistent sealing performance over a broader temperature range
3Productivity
If the sealant substrate has high heat/thermal conductivity, then the seal dwell time is reduced and cycle speed increases, but the seal may not provide adequate peeling functionality
Solution Approach 1:
The patent optimizes the thermal and mechanical parameters of the sealant composition by incorporating organoclay and inorganic filler in controlled amounts, which modifies the heat transfer characteristics and cooling rate during sealing, enabling rapid cycle speeds while maintaining adequate peel force through controlled crystallization and phase transition behavior
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves a consistent and hermetic peelable seal with improved thermal conductivity and caulkability, maintaining desired functionality even as the seals age, without significant loss of peelable seal properties, across a wide range of temperatures.
Implementation Method 1
The ability of the sealant substrate to transfer heat at a high rate (heat/thermal conductivity) results in a significant reduction of seal dwell time, and enables higher cycle speed
Implementation Method 2
resist leaking by providing more caulking of the film seal channels
Implementation Method 3
The elastic properties of the peelable seal ensure that failure of the seal does not occur from flexing and normal handling of the package
Data Source
Figure 1A~1C
Figure 1D~1E
Figure 2A~2B
AI summary
A packaging system has a peelable seal section which includes a first sealing layer and a second sealing layer such that the first sealing layer contacts the second sealing layer to form a peelable seal. The first sealing layer includes thermoplastic polymer or a blend of thermoplastic polymers, an organoclay dispersed within the thermoplastic polymer, and an additional inorganic additive component, such as calcium carbonate, dispersed within the thermoplastic polymer. The peelable seal has achieved synergistic effect and offers high thermal conductivity, great caulkability and is consistent over a broad range of sealing temperatures without loss of desired peelable seal functionality as the seals age.